Well, if we're lookin' at suit-mounted, I'd look into somethin' along the lines of a SMAW rocket. Good anti-tank weapon, the warhead's fairly small and safe. You want just explosives, I've been foolin' around with some explosive gel, got a cocktail of it whipped up. Safe stuff, dries quick after application, and has one hell of a punch. And as usual, I've got some random plasma 'nades laying around.